Remove the speculative resource prefetching code. This was experiment…

…al code added 1.5 years ago and not used for the last year.

BUG=164207,304341
R=cbentzel@chromium.org

Review URL: https://codereview.chromium.org/117933003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243098 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/android/tab_android.cc

@@ -18,8 +18,6 @@
 #include "chrome/browser/net/net_error_tab_helper.h"
 #include "chrome/browser/password_manager/password_manager.h"
 #include "chrome/browser/password_manager/password_manager_delegate_impl.h"
-#include "chrome/browser/predictors/resource_prefetch_predictor_factory.h"
-#include "chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h"
 #include "chrome/browser/prerender/prerender_tab_helper.h"
 #include "chrome/browser/printing/print_view_manager_basic.h"
 #include "chrome/browser/profiles/profile.h"
@@ -113,11 +111,6 @@ void BrowserTabContents::AttachTabHelpers(content::WebContents* contents) {
   TranslateTabHelper::CreateForWebContents(contents);
   WindowAndroidHelper::CreateForWebContents(contents);
 
-  if (predictors::ResourcePrefetchPredictorFactory::GetForProfile(profile)) {
-    predictors::ResourcePrefetchPredictorTabHelper::CreateForWebContents(
-        contents);
-  }
-
 #if defined(ENABLE_MANAGED_USERS)
   if (profile->IsManaged())
     ManagedModeNavigationObserver::CreateForWebContents(contents);

chrome/browser/predictors/predictor_database.cc

@@ -12,8 +12,6 @@
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/predictors/autocomplete_action_predictor_table.h"
 #include "chrome/browser/predictors/logged_in_predictor_table.h"
-#include "chrome/browser/predictors/resource_prefetch_predictor.h"
-#include "chrome/browser/predictors/resource_prefetch_predictor_tables.h"
 #include "chrome/browser/prerender/prerender_field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_thread.h"
@@ -52,15 +50,13 @@ class PredictorDatabaseInternal
   // Cancels pending DB transactions. Should only be called on the UI thread.
   void SetCancelled();
 
-  bool is_resource_prefetch_predictor_enabled_;
   base::FilePath db_path_;
   scoped_ptr<sql::Connection> db_;
 
   // TODO(shishir): These tables may not need to be refcounted. Maybe move them
   // to using a WeakPtr instead.
   scoped_refptr<AutocompleteActionPredictorTable> autocomplete_table_;
   scoped_refptr<LoggedInPredictorTable> logged_in_table_;
-  scoped_refptr<ResourcePrefetchPredictorTables> resource_prefetch_tables_;
 
   DISALLOW_COPY_AND_ASSIGN(PredictorDatabaseInternal);
 };
@@ -70,12 +66,8 @@ PredictorDatabaseInternal::PredictorDatabaseInternal(Profile* profile)
     : db_path_(profile->GetPath().Append(kPredictorDatabaseName)),
       db_(new sql::Connection()),
       autocomplete_table_(new AutocompleteActionPredictorTable()),
-      logged_in_table_(new LoggedInPredictorTable()),
-      resource_prefetch_tables_(new ResourcePrefetchPredictorTables()) {
+      logged_in_table_(new LoggedInPredictorTable()) {
   db_->set_histogram_tag("Predictor");
-  ResourcePrefetchPredictorConfig config;
-  is_resource_prefetch_predictor_enabled_ =
-      IsSpeculativeResourcePrefetchingEnabled(profile, &config);
 }
 
 PredictorDatabaseInternal::~PredictorDatabaseInternal() {
@@ -97,7 +89,6 @@ void PredictorDatabaseInternal::Initialize() {
 
   autocomplete_table_->Initialize(db_.get());
   logged_in_table_->Initialize(db_.get());
-  resource_prefetch_tables_->Initialize(db_.get());
 
   LogDatabaseStats();
 }
@@ -108,7 +99,6 @@ void PredictorDatabaseInternal::SetCancelled() {
 
   autocomplete_table_->SetCancelled();
   logged_in_table_->SetCancelled();
-  resource_prefetch_tables_->SetCancelled();
 }
 
 void PredictorDatabaseInternal::LogDatabaseStats() {
@@ -123,8 +113,6 @@ void PredictorDatabaseInternal::LogDatabaseStats() {
 
   autocomplete_table_->LogDatabaseStats();
   logged_in_table_->LogDatabaseStats();
-  if (is_resource_prefetch_predictor_enabled_)
-    resource_prefetch_tables_->LogDatabaseStats();
 }
 
 PredictorDatabase::PredictorDatabase(Profile* profile)
@@ -150,11 +138,6 @@ scoped_refptr<LoggedInPredictorTable>
   return db_->logged_in_table_;
 }
 
-scoped_refptr<ResourcePrefetchPredictorTables>
-    PredictorDatabase::resource_prefetch_tables() {
-  return db_->resource_prefetch_tables_;
-}
-
 sql::Connection* PredictorDatabase::GetDatabase() {
   return db_->db_.get();
 }

chrome/browser/predictors/predictor_database.h

@@ -19,15 +19,13 @@ namespace predictors {
 class AutocompleteActionPredictorTable;
 class LoggedInPredictorTable;
 class PredictorDatabaseInternal;
-class ResourcePrefetchPredictorTables;
 
 class PredictorDatabase : public BrowserContextKeyedService {
  public:
   explicit PredictorDatabase(Profile* profile);
   virtual ~PredictorDatabase();
 
   scoped_refptr<AutocompleteActionPredictorTable> autocomplete_table();
-  scoped_refptr<ResourcePrefetchPredictorTables> resource_prefetch_tables();
   scoped_refptr<LoggedInPredictorTable> logged_in_table();
 
   // Used for testing.